How to get custom field added to show up on current and existing issue

I’m learning how to work with Forge. I cloned, registered, and installed the Forge-Risk-Assessment example with no problem. I followed the “Usage” section of the file and associated the new field with several screens. But the field doesn’t show up in either new or existing issues.
The default screen is the one configured for issues, as shown in this image that I was forced to delete by the forum.

So why doesn’t this field show when I create or edit an issue?

Plz let me know if anyone has a valid solution to that issue